Unlocked my 6280 ok but the 2600 is giving me problems.

Just need to get this old PAYG phone working with a contract SIM as my work mobile has expired and will be a few days getting replaced.

Any pointers, is the number of attempts limited? If so I've already knackered it!

V3.28
29-09-04
RH-59
(c)NMP
2600